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Investigating GABA and its function in platelets as compared to neurons.

Fatima Shad Kaneez1, Sheikh Arshad Saeed

  • 1Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270. ftmshad@gmail.com

Platelets
|July 29, 2009
PubMed
Summary
This summary is machine-generated.

Platelets can model neuronal receptors, showing similar gamma-aminobutyric acid (GABA) metabolism and function. This research suggests platelets offer a peripheral model for studying neurological conditions like epilepsy.

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Area of Science:

  • Neuroscience
  • Hematology
  • Pharmacology

Background:

  • Platelets are increasingly recognized for their potential as models for neuronal receptors.
  • Gamma-aminobutyric acid (GABA) is a key neurotransmitter in the central nervous system, implicated in various neuropathologic conditions.

Purpose of the Study:

  • To investigate gamma-aminobutyric acid (GABA) metabolism and receptor activity in platelets compared to cultured neurons.
  • To determine if platelet GABA activity mimics neuronal GABA receptor functions.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) was used to quantify GABA concentrations in platelet-rich plasma (PRP) and cultured neurons.
  • Platelet aggregation was measured using an aggregometer to assess functional responses to GABA and its receptor ligands.
  • The effects of benzodiazepines, calcium channel blockers, and Wortmannin (a PI3-kinase antagonist) on GABA-induced platelet aggregation were evaluated.

Main Results:

  • GABA concentration was found to be 30% lower in platelets than in neurons.
  • Both platelets and neurons metabolize GABA via GABA transaminase (GABA-T).
  • GABA potentiated calcium-dependent platelet aggregation, an effect inhibited by benzodiazepines, calcium channel blockers, and Wortmannin, indicating PI3-kinase involvement.

Conclusions:

  • Platelets exhibit functional similarities to neuronal GABA receptors, supporting their use as a peripheral model.
  • This platelet model can be utilized to study neuronal GABAergic function and its dysregulation in diseases like epilepsy and schizophrenia.
  • Phosphoinositide 3-kinase (PI3-kinase) plays a role in GABA-induced platelet aggregation.